Nadiia Leonidivna Kolb (; born 19 January 1993) is a Ukrainian tennis player.

She has a career-high WTA singles ranking of No. 584, achieved on 12 August 2024. Her best doubles ranking of world No. 173, she achieved on 9 September 2024.

Nadiia was born in the city of Yevpatoriya. Her younger sister Maryna, who is also a professional tennis player, is her regular doubles partner.

Nadiia made her WTA Tour main-draw debut at the 2024 Hong Kong Tennis Open, partnering with younger sister Maryna Kolb in doubles. They defeated Japanese duo Aoi Ito and Kyōka Okamura in the first round. In the quarter-finals, they were defeated by Norwegian Ulrikke Eikeri and Japanese Makoto Ninomiya.

ITF Circuit finals

Singles: 2 (0 titles, 2 runner-ups) LegendW15 tournaments ResultW–LDateTournamentTierSurfaceOpponentScoreLoss 0–1 Oct 2022ITF Baza, SpainW15 Hard Lucía Peyre 3–6, 3–6Loss 0–2 Aug 2024ITF Savitaipale, FinlandW15 Clay Zuzanna Pawlikowska 7–5, 2–6, 1–6

Doubles: 38 (11 titles, 27 runner-up) LegendW80 tournaments W60/75 tournamentsW40/50 tournaments W25/35 tournaments W10/15 tournaments ResultNo.DateTournamentTierSurfacePartnerOpponentsScoreLoss 0–1 Jul 2013ITF Istanbul, TurkeyW10 Hard Maryna Kolb Polina Leykina Lidziya Marozava 6–7(2), 5–7Loss 0–2 Nov 2013ITF Heraklion, GreeceW10 Carpet Maryna Kolb Csilla Borsányi Ilka Csöregi 6–4, 3–6, [9–11]Loss 0–3 Jun 2014ITF Galați, RomaniaW10 Clay Maryna Kolb Camelia Hristea Patricia Maria Țig 3–6, 1–6Loss 0–4 Aug 2014ITF Ostrava, Czech RepublicW10 Clay Maryna Kolb Lenka Kunčíková Karolína Stuchlá 6–4, 2–6, [7–10]Loss 0–5 Oct 2014ITF Oslo, NorwayW10 Hard (i) Maryna Kolb Alexa Guarachi Nina Stojanović 4–6, 6–7(7)Loss 0–6 Nov 2014ITF Oslo, NorwayW10 Hard (i) Maryna Kolb Alexa Guarachi Daria Lodikova 3–6, 6–2, [6–10]Loss 0–7 Jun 2015ITF Niš, SerbiaW10 Clay Maryna Kolb Ailen Crespo Azconzábal Ana Victoria Gobbi Monllau 1–6, 2–6Loss 0–8 Jul 2015ITF Prokuplje, SerbiaW10 Clay Maryna Kolb Estrella Cabeza Candela Alexandra Nancarrow 6–2, 4–6, [6–10]Loss 0–9 Jul 2015ITF Iași, RomaniaW10 Clay Maryna Kolb Ioana Loredana Roșca Oana Georgeta Simion 3–6, 5–7Loss 0–10 Aug 2015ITF Plovdiv, BulgariaW10 Clay Maryna Kolb Alexandra Nancarrow Yana Sizikova 3–6, 3–6Win 1–10 Sep 2015ITF Prague, Czech RepublicW10 Clay Maryna Kolb Tina Tehrani Karolina Wlodarczak 6–4, 6–2Loss 1–11 Apr 2016ITF Győr, HungaryW10 Clay Maryna Kolb Daiana Negreanu Rebeka Stolmár 6–7(4), 0–6Loss 1–12 Jun 2016ITF Szczawno-Zdrój, PolandW10 Clay Maryna Kolb Olga Brózda Anastasiya Shoshyna 2–6, 6–7(4)Win 2–12 Sep 2016ITF Chișinău, MoldovaW10 Clay Maryna Kolb Veronika Kapshay Angelina Shakhraychuk 5–7, 7–5, [10–6] Loss 2–13 Sep 2017ITF Prague, Czech RepublicW15 Clay Natalie Pröse Anastasia Dețiuc Johana Marková 2–6, 2–6Win 3–13 Sep 2017ITF Kyiv, UkraineW15 Clay Maryna Kolb Martina Colmegna Michele Alexandra Zmău 6–2, 4–6, [13–11] Loss 3–14 Nov 2017ITF Stockholm, SwedenW15 Hard (i) Maryna Kolb Malene Helgø Fanny Östlund w/oWin 4–14 Nov 2017ITF Minsk, BelarusW15 Hard (i) Maryna Kolb Manon Arcangioli Alena Tarasova 5–7, 6–4, [10–7]Loss 4–15 Dec 2017ITF Milovice, Czech RepublicW15 Hard (i) Maryna Kolb Jana Jablonovská Lena Papadakis 1–6, 3–6Win 5–15 Sep 2018ITF Chornomorsk, UkraineW15 Clay Maryna Kolb Alexandra Perper Anastasia Vdovenco 6–4, 6–4Win 6–15 Aug 2022ITF Bydgoszcz, Poland W15 Clay Maryna Kolb Valeriia Olianovskaia Stefania Rogozińska Dzik 6–4, 1–6, [10–7]Win 7–15 Sep 2022ITF Ceuta, Spain W15 Hard Maryna Kolb Lucía Llinares Domingo Olga Parres Azcoitia 6–4, 6–2Loss 7–16 Oct 2022ITF Baza, Spain W15 Hard Maryna Kolb Lucía Llinares Domingo Olga Parres Azcoitia 5–7, 6–2, [11–13]Loss 7–17 Oct 2022ITF Seville, SpainW25 Clay Maryna Kolb İpek Öz Nika Radišić 5–7, 6–7(3)Win 8–17 Sep 2022ITF Gdańsk, PolandW15 Clay Maryna Kolb Gina Feistel Marcelina Podlińska 6–0, 6–1Loss 8–18 Sep 2023ITF Frýdek-Místek, Czech RepublicW25 Clay Maryna Kolb Mana Kawamura Linda Klimovičová 1–6, 3–6Loss 8–19 Sep 2023ITF Féminin Le Neubourg, FranceW80 Hard Maryna Kolb Fiona Ferro Alina Korneeva 6–7(7), 5–7Loss 8–20 Sep 2023ITF Santarém, Portugal W25 Hard Maryna Kolb Dalayna Hewitt Madison Sieg 6–4, 2–6, [10–12]Win 9–20 Oct 2023ITF Seville, Spain W25 Clay Maryna Kolb Cristina Dinu Sapfo Sakellaridi 6–1, 6–1Win 10–20 Oct 2023ITF Faro, PortugalW25 Hard Maryna Kolb Diāna Marcinkēviča Sapfo Sakellaridi 6–4, 6–3Loss 10–21 Oct 2023ITF Castellón, Spain W15 Clay Maryna Kolb Marie Mettraux Chantal Sauvant 6–3, 1–6, [5–10]Loss 10–22 Nov 2023ITF Nules, Spain W15 Clay Maryna Kolb Yvonne Cavallé Reimers Ángela Fita Boluda 1–6, 2–6Loss 10–23 Aug 2024ITF Bytom, PolandW50 Clay Maryna Kolb Nicole Fossa Huergo Zhibek Kulambayeva 6–7(6), 2–6Loss 10–24 Aug 2024ITF Bydgoszcz, PolandW35 Clay Maryna Kolb Sada Nahimana Rinon Okuwaki 4–6, 1–6Loss 10–25 Aug 2024ITF Brașov, RomaniaW35 Clay Maryna Kolb Ksenia Laskutova Nina Vargová 3–6, 4–6Loss 10–26 Sep 2024Ladies Open Vienna, AustriaW75 Clay Maryna Kolb Emily Appleton Estelle Cascino 4–6, 6–7(1)Loss 10–27 Jan 2026ITF Porto, PortugalW75 Hard (i) Kristina Novak Francisca Jorge Matilde Jorge 2–6, 4–6Win 11–27 Feb 2026ITF Heraklion, GreeceW35 Clay Yasmine Kabbaj Katharina Hobgarski Nina Vargová 6–2, 6–1

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